SHEIK HUSSEIN VILLAGE, Jordan -- For years, Ibrahim Alayyan watched in frustration as rats devoured the date palms at his lush family farm.

Having no luck with pesticides, the retired Jordanian heart surgeon was only too eager to try a pest control agent widely used in fields just across the Jordan River in Israel -- owls.

"There used to be so many rats," Alayyan said. "But after we put in the owls, thank God, this is the first time we have had a full date harvest."

To the world, the symbol of peace may be a dove, but to farmers on either side of the Jordan, it's Tyto alba, the common barn owl.

Alayyan is one of dozens of Jordanians working in cooperation with Israeli colleagues, targeting rodents with a natural predator instead of with chemicals.

The effort still faces suspicions and superstitions, but organizers hope the message of their partial success will spread to Lebanon, Syria and other Middle Eastern countries, and demonstrate the fruits of the 1994 peace treaty that ended a 46-year state of war between Israel and Jordan.

Political benefits aside, the project is driven foremost by environmental concerns.

In the late 1970s, chemicals killed hundreds of birds in northern Israel, said Yossi Leshem, an Israeli ornithologist and director of the International Center for the Study of Bird Migration.

So Leshem persuaded Sde Eliyahu, a kibbutz south of the Sea of Galilee, to try owls, which can eat up to 10 rodents a day. All the farmers needed was to build boxes where the birds could mate and raise their young.

"I put up 14 barn owl boxes, and everybody laughed at me," said Shauli Aviel, who oversees the effort at the collective farm.

A few years later, Sde Eliyahu's rat problem had vanished, he said. More than 60 nesting boxes now sit on the grounds of the kibbutz, and the technique has caught on with other farmers along the Jordan.

Yet as the owl population grew, the birds increasingly began flying -- and looking to nest -- across the nearby border with Jordan, where pesticide use remains rampant. Chemicals seeped into the water table, and owls were poisoned by eating contaminated rodents.

Then came the peace treaty, Israelis and Jordanians got used to being good neighbors, and in late 2002 Aviel and fellow Israeli farmers planned a regional conference on barn owls to explain their advantages to colleagues across the Jordan River.

The response was discouraging. Many Arabs consider owls the same way others view black cats -- as bad luck. Word came back to the Israelis that no Jordanians would attend.

So the organizers changed the title of the conference to focus on organic farming, and two dozen Jordanians turned up. Midway through the gathering they were given a demonstration on owls, and soon Jordanian farmers were asking how they could attract owls to their fields, Aviel said.

With funding from the Jewish Community Federation of Cleveland, Ohio, the kibbutz gave the Jordanians advice and building materials. More than three dozen nesting boxes have since been put up in Jordan, organizers said.

Among the most eager participants was Alayyan, a former chief of cardiovascular surgery at a Jordanian hospital. He agreed to build a nesting box at his family's farm in the village of Sheik Hussein, six miles from Aviel's kibbutz.

"For me, it was a real pleasure to find a man like that on the other side of the border," said Aviel, as he and Alayyan surveyed a group of newborn owl nestlings. Unable to communicate in their own languages, the two men spoke to each other in English, but when it came to nature and conservation, "He spoke in my language," Aviel said.

The project also has gotten support from political and former military leaders in both countries, including Mansour Abu Rashed, the former head of Jordanian intelligence.

Rashed, who heads the Amman Center for Peace and Development, said organizers are "under no illusions" the owl project will ease Mideast tensions; the goal is simply "to bring people together, to let them talk and build confidence."

But obstacles remain. After the U.S.-led invasion of Iraq in March 2003, Israeli farmers delayed the initial delivery of building materials to Jordan for the owl boxes because of the tense atmosphere. Arabic posters promoting the benefits of barn owls make no mention of Israel.

Some Israeli organizers have expressed frustration at the pace of progress in Jordan. And last month, some nesting boxes on Jordanian farms were stolen or vandalized. Although it was unclear whether the vandalism was driven by owl-phobia or by Israel's involvement, it upset Leshem, the Israeli ornithologist.

"We are wasting our money and time, coming and putting boxes -- and then, suddenly, they are destroyed," he said after a recent meeting with the Jordanians.

Organizers also say the project has gained little traction among Palestinians, because of security restrictions that make it hard for them and Israelis to travel to each other's territory for meetings.

Still, even when tensions run high, the environment is one of the few areas where Israelis and Arabs cooperate. The owl conference went ahead at a time when the Palestinian uprising against Israel was at its peak, and during that uprising, Israeli and Palestinian officials maintained contacts on issues such as water quality and waste removal.

The Arava Institute for Environmental Studies in southern Israel trains Jewish and Arab students, including Jordanians and Palestinians, in solving ecological problems.

Friends of the Earth-Middle East, an organization of Israeli, Jordanian and Palestinian environmentalists, leads joint efforts to clean up the Jordan River and promote eco-tourism packages on both sides of the border.

"We're doing something our governments are not able to do," says Mira Edelstein, an organization spokeswoman. "If people know how to highlight the environmental benefits that can come out of this type of cooperation, then it's not political anymore."